DTC P2101: ETCS Malfunction

CAUTION: Do not insert your fingers into the installed throttle body when you turn the ignition switch to ON (II) or while the ignition switch is in ON (II). If you do, you will seriously injure your fingers if the throttle valve is activated.

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).

Turn the ignition switch to ON (II).
Reset the ECM with the HDS.
Do the ETCS TEST in the INSPECTION MENU with the HDS.
Check for Pending or Confirmed DTCs with the HDS.
Is DTC P2101 indicated?

YES -Go to step 7.

NO -Go to step 5.
Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters:
- ENGINE SPEED
- VEHICLE SPEED
- APP SENSOR A
Check for Pending or Confirmed DTCs with the HDS.
Is DTC P2101 indicated?

YES -Go to step 7.

NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the throttle body and the ECM/PCM, then clean the throttle body (see THROTTLE BODY CLEANING ).
Turn the ignition switch to LOCK (0).
Remove the air cleaner (see AIR CLEANER ELEMENT INSPECTION/REPLACEMENT ).
Turn the ignition switch to ON (II).
Reset the ECM with the HDS.
Do the ETCS TEST in the INSPECTION MENU with the HDS.
Visually check the throttle valve operation.
Does the throttle valve operate smoothly?

YES -Clean the throttle body (see THROTTLE BODY CLEANING ), then go to step 22 and recheck. If DTC P2101 is indicated, go to step 19.

NO -Go to step 13.
Turn the ignition switch to LOCK (0).
Disconnect the throttle body 6P connector.
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector C (44P).
Connect throttle body 6P connector terminals No. 1 and No. 2 with a jumper wire.

Fig 1: Connecting Throttle Body 6P Connector Terminals No. 1 And No. 2 With Jumper Wire
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Check for continuity between ECM/PCM connector terminals C3 and C4.

Fig 2: Checking Continuity Between ECM/PCM Connector Terminals C3 And C4
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Go to step 27.

NO -Repair an open in the wires between the ECM/PCM (C3, C4) and the throttle body, then go to step 21.
Turn the ignition switch to LOCK (0).
Replace the throttle body (see THROTTLE BODY REMOVAL/INSTALLATION ).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN PROCEDURE ).
Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters:
- ENGINE SPEED
- VEHICLE SPEED
- APP SENSOR A
Check for Pending or Confirmed DTCs with the HDS.
Is DTC P2101 indicated?

YES -Check for poor connections or loose terminals at the throttle body and the ECM/PCM, then clean the throttle body (see THROTTLE BODY CLEANING ), and go to step 1.

NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC'S TROUBLESHOOTING .
Reconnect all connectors.
Update the ECM/PCM if it does not have the latest software (see ELD REPLACEMENT ), or substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ).
Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters:
- ENGINE SPEED
- VEHICLE SPEED
- APP SENSOR A
Check for Pending or Confirmed DTCs with the HDS.
Is DTC P2101 indicated?

YES -Check for poor connections or loose terminals at the throttle body and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ), then go to step 28. If the ECM/PCM was substituted, go to step 1.

NO -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see ECM/PCM REPLACEMENT ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC'S TROUBLESHOOTING .